Linear actuator with protection mechanism

Abstract

A linear actuator (1) with the protection mechanism includes: a motor case (10) having a case member (11) with a bottom plate (111) on which a through hole (114) is formed; a drive mechanism (20) accommodated in the case member (11); a transmission mechanism (30) having a machine core (31), a bearing (32), a base seat (33) with an extending plate (332) on which a penetrated hole (333) is formed, and a fasten unit (34) with a head part (341), the machine core (31) is connected to the drive mechanism (20), the bearing (32) is disposed on the base seat (33) and sheathes the machine core (31), the fasten unit (34) is fastened with the bottom plate (111); and a protection structure (40) sheathing the fasten unit (34) and disposed between the bottom plate (111) and the head part (341).

What is claimed is: 
     
         1 . A linear actuator ( 1 ), comprising:
 a motor case ( 10 ), comprising a case member ( 11 ), wherein the case member ( 11 ) comprises a bottom plate ( 111 ), and a through hole ( 114 ) is defined on the bottom plate ( 111 );   a drive mechanism ( 20 ), accommodated in the case member ( 11 );   a transmission mechanism ( 30 ), comprising a machine core ( 31 ), a bearing ( 32 ), a base seat ( 33 ) and a fasten unit ( 34 ), wherein the machine core ( 31 ) passes through the through hole ( 114 ) and is connected to the drive mechanism ( 20 ), the base seat ( 33 ) comprises an extending plate ( 332 ), the extending plate ( 332 ) comprises a penetrated hole ( 333 ), the bearing ( 32 ) is disposed on the base seat ( 33 ) and adapted to sheathe the machine core ( 31 ), the fasten unit ( 34 ) passes through the penetrated hole ( 333 ) to be fastened with the bottom plate ( 111 ), and the fasten unit ( 34 ) comprises a head part ( 341 ); and   an elastic member ( 41 ) and a pressure-sensitive sensor ( 42 ), adapted to sheathe the fasten unit ( 34 ) and disposed between the bottom plate ( 111 ) and the head part ( 341 ).   
     
     
         2 . The linear actuator ( 1 ) according to  claim 1 , wherein the base seat ( 33 ) further comprises a bearing cave ( 331 ), the extending plate ( 332 ) is extended from the bearing cave ( 331 ), and the bearing ( 32 ) is disposed in the bearing cave ( 331 ). 
     
     
         3 . The linear actuator ( 1 ) according to  claim 2 , wherein the elastic member ( 41 ) and the pressure-sensitive sensor ( 42 ) are disposed between the bottom plate ( 111 ) and the extending plate ( 332 ) and are stacked with each other. 
     
     
         4 . The linear actuator ( 1 ) according to  claim 3 , wherein the pressure-sensitive sensor ( 42 ) is disposed between the bottom plate ( 111 ) and the elastic member ( 41 ). 
     
     
         5 . The linear actuator ( 1 ) according to  claim 3 , wherein the pressure-sensitive sensor ( 42 ) is disposed between the elastic member ( 41 ) and the extending plate ( 332 ). 
     
     
         6 . The linear actuator ( 1 ) according to  claim 1 , wherein an amount of the extending plate ( 332 ), the elastic member ( 41 ) and the pressure-sensitive sensor ( 42 ) are all multiple. 
     
     
         7 . The linear actuator ( 1 ) according to  claim 1 , wherein the pressure-sensitive sensor ( 42 ) is embedded in the elastic member ( 41 ). 
     
     
         8 . The linear actuator ( 1 ) according to  claim 7 , wherein the elastic member ( 41 ) comprises a first hole ( 411 ), the pressure-sensitive sensor ( 42 ) comprises a second hole ( 421 ), and the second hole ( 421 ) of the pressure-sensitive sensor ( 42 ) and the first hole ( 411 ) of the clastic member ( 41 ) are correspondingly arranged.